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fixup-jmr3927.c

/*
 *
 * BRIEF MODULE DESCRIPTION
 *    Board specific pci fixups.
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *          ppopov@mvista.com or source@mvista.com
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/types.h>
#include <asm/txx9/pci.h>
#include <asm/txx9/jmr3927.h>

int __init jmr3927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
      unsigned char irq = pin;

      /* IRQ rotation (PICMG) */
      irq--;                  /* 0-3 */
      if (slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(23)) {
            /* PCI CardSlot (IDSEL=A23, DevNu=12) */
            /* PCIA => PCIC (IDSEL=A23) */
            /* NOTE: JMR3927 JP1 must be set to OPEN */
            irq = (irq + 2) % 4;
      } else if (slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(22)) {
            /* PCI CardSlot (IDSEL=A22, DevNu=11) */
            /* PCIA => PCIA (IDSEL=A22) */
            /* NOTE: JMR3927 JP1 must be set to OPEN */
            irq = (irq + 0) % 4;
      } else {
            /* PCI Backplane */
            if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
                  irq = (irq + 33 - slot) % 4;
            else
                  irq = (irq + 3 + slot) % 4;
      }
      irq++;                  /* 1-4 */

      switch (irq) {
      case 1:
            irq = JMR3927_IRQ_IOC_PCIA;
            break;
      case 2:
            irq = JMR3927_IRQ_IOC_PCIB;
            break;
      case 3:
            irq = JMR3927_IRQ_IOC_PCIC;
            break;
      case 4:
            irq = JMR3927_IRQ_IOC_PCID;
            break;
      }

      /* Check OnBoard Ethernet (IDSEL=A24, DevNu=13) */
      if (dev->bus->parent == NULL &&
          slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(24))
            irq = JMR3927_IRQ_ETHER0;
      return irq;
}

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